Discussion on Measuring Method of Hole Shape Error of Main Bearing Hole of Diesel Engine Body

1. INTRODUCTION At present, the measurement of the roundness and cylindricity error of the body hole and the box hole is generally carried out by using the scale method or the inner diameter micrometer to measure the aperture, and then performing the calculated method. Although these methods are simple in operation, they are only suitable for occasions with low precision requirements and small size. For a medium-speed high-power diesel engine body, the detection accuracy is high and the measured hole size is large. Convenient and has great limitations. In addition, these methods are only an alternative to the roundness and cylindricity error measurement of the hole.

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